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Galaxy cluster in Pegasus

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This galaxy cluster is located within the Great Square of Pegasus. The brightest member of this cluster is NGC 7647, the elliptical galaxy in the center of this image. At magnitude 13.6, NGC 7647 is the only member of this cluster that can be readily observed through typical amateur telescopes.

Over 100 galaxies have been shown to be members of this cluster because they have similar redshits, which indicates that their distances from us are approximately the same. The distance of this group may be in the range of 500 million light years.

NGC 7647:

Magnitude 13.6
Apparent Size 1.8' x 1'
Right Ascension 23:24.0
Declination +16 47
Field of View 29' x 22'

Image details:  Exposure times of 138 minutes luminance and 30 minutes each of red, green, and blue, taken with an SBIG ST-8300M imager and a 14" Meade LX850 telescope at f/6.

November 2014